High severityNVD Advisory· Published Mar 6, 2026· Updated Mar 6, 2026
CoreDNS ACL Bypass
CVE-2026-26017
Description
CoreDNS is a DNS server that chains plugins. Prior to version 1.14.2, a logical vulnerability in CoreDNS allows DNS access controls to be bypassed due to the default execution order of plugins. Security plugins such as acl are evaluated before the rewrite plugin, resulting in a Time-of-Check Time-of-Use (TOCTOU) flaw. This issue has been patched in version 1.14.2.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/coredns/corednsGo | < 1.14.2 | 1.14.2 |
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
4- github.com/advisories/GHSA-c9v3-4pv7-87prghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-26017ghsaADVISORY
- github.com/coredns/coredns/releases/tag/v1.14.2ghsax_refsource_MISCWEB
- github.com/coredns/coredns/security/advisories/GHSA-c9v3-4pv7-87prghsax_refsource_CONFIRMWEB
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